javascript-patterns/function-patterns/callback.html at master · RdAllen/javascript-patterns

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<!doctype html>

<head>

<title>JavaScript Patterns</title>

</head>

<body>

/* Title: Callback patterns

Description: when you pass function A to function B as a parameter, function A is a callback function

var complexComputation = function () { /* do some complex stuff and return a node */

};

var findNodes = function (callback) {

var nodes = [];

var node = complexComputation();

// call if callback is callable

if (typeof callback === "function") {

callback(node);

}

nodes.push(node);

return nodes;

};

// a callback function

var hide = function (node) {

node.style.display = "none";

};

// find the nodes and hide them as you go

var hiddenNodes = findNodes(hide);

// you can also use an anonymous function, like this:

var blockNodes = findNodes(function (node) {

node.style.display = 'block';

});

// reference

// http://www.jspatterns.com/

// http://shop.oreilly.com/product/9780596806767.do?sortby=publicationDate

</script>

</body>

</html>

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